Then make it optional then. I dont care if its buggy, it will get fixed over time. smokinonthatKK has a good point, some of you have no imagination, we should be able to make this game at least the tiniest bit realistic. I do agree the knockout is a bit iffy for that would just make the game WAAAAY to easy.
Also the choking would take a while, like 100 frames or something to give the other person a chance to defend against it. Also someone ( I forget who ) said that it would be glitchy, like headgrab = choke, that is still realistic, if someone was squeezing really tight on your head in real life, would you be able to breath? Probably not, When I was wrestling with one of my friends I still choked him out from squeezing his head.
Also it wouldn't be a grab it would be like you wrap your arms around your opponents head/neck.